each pic is a picture of a previous level. Take the numbers from that pic, and count that many numbers from the usernamer. for instance, level 4 (this is false):
4
vood
d would be 4.
Now, if the number has a # in fron of it, you have to find the letter, and then the exact oppososite of that letter:

I won't give you the answer, just some incredibly obvious hints. that way, its on cheating!
PS, the hints are in white!look for the source of the mater, and url never find the music.visualize the music (jpegs work well)the instrument's hole, is where you will tell!
if that isn't painfully obvious without being a spoiler, idk what is!